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Which is faster in Python: x**.5 or math.sqrt(x)?
...= 123" "math.sqrt(x)"
1000000 loops, best of 3: 0.727 usec per loop
This test shows that x**.5 is slightly faster than sqrt(x).
For the Python 3.0 the result is the opposite:
$ \Python30\python -mtimeit -s"from math import sqrt; x = 123" "x**.5"
1000000 loops, best of 3: 0.803 usec per loop
$ \...
Git push rejected after feature branch rebase
...rebase master
git merge -s ours old-feature
git push origin feature
(Not tested, but I think that's right...)
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When saving, how can you check if a field has changed?
...Josh's answer, this code will deceptively work fine on your single-process testing server, but the moment you deploy it to any sort of multi-processing server, it will give incorrect results. You can't know if you're changing the value in the database without querying the database.
...
UIButton Long Press Event
...hat I've never bothered to solve. Says it is a possible leak, thought I've tested the code and it doesn't leak.
@interface MYLongButton ()
@property (nonatomic, strong) UILongPressGestureRecognizer *gestureRecognizer;
@property (nonatomic, strong) id gestureRecognizerTarget;
@property (nonatomic, a...
How can I determine if a variable is 'undefined' or 'null'?
...
I'm trying to test if event is null in firefox and an error blocks the execution: "event is undefined"
– Entretoize
Sep 6 '18 at 10:32
...
AngularJS: Basic example to use authentication in Single Page Application
...g any authentication related thing on front-end
My 'technique' on my latest app is.. the client doesn't care about
Auth. Every single thing in the app requires a login first, so the
server just always serves a login page unless an existing user is
detected in the session. If session.user...
Is it possible to figure out the parameter type and return type of a lambda?
...e element of a tuple
// composed of those arguments.
};
};
// test code below:
int main()
{
auto lambda = [](int i) { return long(i*10); };
typedef function_traits<decltype(lambda)> traits;
static_assert(std::is_same<long, traits::result_type>::value, "err");
...
How to detect if a variable is an array
...sOwnProperty && ; also, is this still an issue with IE7? my simple tests via task manager suggest that the memory got reclaimed after minimizing the browser...
– Christoph
Jun 29 '09 at 18:32
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Comparing two dataframes and getting the differences
...ponse above.
df_diff = pd.concat([df1,df2]).drop_duplicates(keep=False)
Testing with these dataframes:
df1=pd.DataFrame({
'Date':['2013-11-24','2013-11-24','2013-11-24','2013-11-24'],
'Fruit':['Banana','Orange','Apple','Celery'],
'Num':[22.1,8.6,7.6,10.2],
'Color':['Yellow','Oran...
How to bind an enum to a combobox control in WPF?
...
Tested example from first link, works OK. See added code and comment in my answer.
– Kyrylo M
May 26 '11 at 23:02
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